IC OVERVOLTAGE/CUR PROT 8-DFN

 

LTC4361CDC-2#TRMPBF

Manufacturer Part NumberLTC4361CDC-2#TRMPBF
DescriptionIC OVERVOLTAGE/CUR PROT 8-DFN
ManufacturerLinear Technology
TypeOvervoltage and Overcurrent Controller
LTC4361CDC-2#TRMPBF datasheets

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Specifications of LTC4361CDC-2#TRMPBF

ApplicationsGeneral PurposeInternal Switch(s)No
Voltage - Supply2.5 V ~ 5.5 VOperating Temperature0°C ~ 70°C
Mounting TypeSurface MountPackage / Case8-WFDFN Exposed Pad
Lead Free Status / RoHS StatusLead free / RoHS CompliantOther namesLTC4361CDC-2#TRMPBFTR
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FEATURES
n
2.5V to 5.5V Operation
n
Overvoltage Protection Up to 80V
n
No Input Capacitor or TVS Required for Most
Applications
n
2% Accurate 5.8V Overvoltage Threshold
n
10% Accurate 50mV Overcurrent Circuit Breaker
n
<1μs Overvoltage Turn-Off, Gentle Shutdown
n
Controls N-Channel MOSFET
n
Adjustable Power-Up dV/dt Limits Inrush Current
n
Reverse Voltage Protection
n
Power Good Output
n
Low Current Shutdown
n
Latchoff (LTC4361-1) or Auto-Retry (LTC4361-2)
After Overcurrent
n
Available in 8-Lead ThinSOT™ and 8-Lead
(2mm × 2mm) DFN Packages
APPLICATIONS
n
USB Protection
n
Handheld Computers
n
Cell/Smart Phones
n
MP3/MP4 Players
n
Digital Cameras
TYPICAL APPLICATION
Protection from Overvoltage and Overcurrent
0.025Ω
Si1470DH
V
IN
5V
GATE
SENSE
OUT
IN
LTC4361
ON
PWRGD
GND
436112 TA01a
LTC4361-1/LTC4361-2
Overvoltage/Overcurrent
Protection Controller
DESCRIPTION
The LTC
®
4361 overvoltage/overcurrent protection control-
ler safeguards 2.5V to 5.5V systems from input supply
overvoltage. It is designed for portable devices with
multiple power supply options including wall adaptors,
car battery adaptors and USB ports.
The LTC4361 controls an external N-channel MOSFET in
series with the input power supply. During overvoltage
transients, the LTC4361 turns off the MOSFET within
1μs, isolating downstream components from the input
supply. Inductive cable transients are absorbed by the
MOSFET and load capacitance. In most applications, the
LTC4361 provides protection from transients up to 80V
without requiring transient voltage suppressors or other
external components.
The LTC4361 has a delayed start-up and adjustable dV/dt
ramp-up for inrush current limiting. A PWRGD pin provides
power good monitoring for V
shutdown controlled by the ON pin and drives an optional
external P-channel MOSFET for negative voltage protection.
Following an overvoltage condition, the LTC4361 automati-
cally restarts with a start-up delay. After an overcurrent
fault, the LTC4361-1 remains off while the LTC4361-2
automatically restarts after a 130ms start-up delay.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT, Hot Swap, No R
SENSE
Corporation. All other trademarks are the property of their respective owners.
Output Protected from Overvoltage at Input
V
OUT
5V
1.5A
C
OUT
V
, V
IN
OUT
5V/DIV
V
GATE
10V/DIV
Si1470DH
C
OUT
. The LTC4361 features a soft
IN
and PowerPath are trademarks of Linear Technology
V
IN
V
OUT
436112 TA01b
0.5μs/DIV
= 10μF
436112fa
1

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LTC4361CDC-2#TRMPBF Summary of contents

  • Page 1

    ... After an overcurrent fault, the LTC4361-1 remains off while the LTC4361-2 automatically restarts after a 130ms start-up delay. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and ThinSOT, Hot Swap SENSE Corporation. All other trademarks are the property of their respective owners. ...

  • Page 2

    ... LTC4361CTS8-2#TRMPBF LTC4361CTS8-2#TRPBF LTC4361ITS8-1#TRMPBF LTC4361ITS8-1#TRPBF LTC4361ITS8-2#TRMPBF LTC4361ITS8-2#TRPBF LTC4361CDC-1#TRMPBF LTC4361CDC-1#TRPBF LTC4361CDC-2#TRMPBF LTC4361CDC-2#TRPBF LTC4361IDC-1#TRMPBF LTC4361IDC-1#TRPBF LTC4361IDC-2#TRMPBF LTC4361IDC-2#TRPBF TRM = 500 pieces. *Temperature grades are identifi label on the shipping container. Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. Consult LTC Marketing for information on lead based fi nish parts. ...

  • Page 3

    ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER Supplies V Input Voltage Range IN V Input Undervoltage Lockout IN(UVL) I Input Supply Current IN Thresholds V IN Pin Overvoltage Threshold IN(OV) ∆V Overvoltage Hysteresis OV ∆V ...

  • Page 4

    LTC4361-1/LTC4361-2 TYPICAL PERFORMANCE CHARACTERISTICS T = 25° 5V 0V, unless otherwise noted Input Supply Current vs Input Voltage 10000 1000 100 0.1 1 ...

  • Page 5

    PIN FUNCTIONS Exposed Pad (DFN): Ground. Connection to PCB is optional. GATE: Gate Drive for External N-Channel MOSFET. An internal charge pump provides a 10μA pull-up current to charge the gate of the external N-channel MOSFET. An additional ramp circuit ...

  • Page 6

    LTC4361-1/LTC4361-2 OPERATION Mobile devices like cell phones and MP3/MP4 players have highly integrated subsystems fabricated from deep submi- cron CMOS processes. The small form factor is accompanied by low absolute maximum voltage ratings. The sensitive electronics are susceptible to damage ...

  • Page 7

    APPLICATIONS INFORMATION The typical LTC4361 application protects 2.5V to 5.5V systems in portable devices from power supply overvolt- age. The basic application circuit is shown in Figure 1. Device operation and external component selection is discussed in detail in the ...

  • Page 8

    LTC4361-1/LTC4361-2 APPLICATIONS INFORMATION The LTC4361-1 has an internal latch that maintains this off state until it is reset. To reset this latch, cycle IN be above 1.5V (V low 2.1V (V IN(UVL) than 500μs. After reset, the ...

  • Page 9

    APPLICATIONS INFORMATION ON Input CMOS compatible, active low enable input. It has a default 5μA pull-down to ground. Connect this pin to ground or leave open to enable normal device operation driven high while ...

  • Page 10

    LTC4361-1/LTC4361-2 APPLICATIONS INFORMATION WALL ADAPTOR AC/ CABLE + CABLE WALL ADAPTOR AC/ SENSE IN I CABLE + CABLE Input Transients Figure 4 shows a typical setup when an AC ...

  • Page 11

    APPLICATIONS INFORMATION As the IN pin can withstand up to 80V, a high voltage N- channel MOSFET can be used to protect the system against rugged abuse from high transient or DC voltages up to the BV of the MOSFET. ...

  • Page 12

    LTC4361-1/LTC4361-2 APPLICATIONS INFORMATION Figure 8 shows a particularly severe situation which can occur in a mobile device with dual power inputs. A 20V wall adaptor is mistakenly hot-plugged into the 5V device with the USB input already live. As shown ...

  • Page 13

    PACKAGE DESCRIPTION 2.55 ±0.05 0.64 ±0.05 1.15 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED PIN 1 BAR TOP MARK (SEE NOTE 6) 0.200 REF LTC4361-1/LTC4361-2 DC Package 8-Lead Plastic ...

  • Page 14

    LTC4361-1/LTC4361-2 PACKAGE DESCRIPTION 0.40 MAX 3.85 MAX 2.62 REF RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.20 BSC DATUM ‘A’ 0.30 – 0.50 REF NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF ...

  • Page 15

    ... Revised GATE Control in Applications Information Section Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

  • Page 16

    ... M3 C OUT 10μF GATE SENSE OUT V IO LTC4361 GATEP D1 ON PWRGD LN1351CTR GND 436112 TA03 : 3μ 2.0V to 45V 0.6V to 39.5V OUT : 3μ 1.6V to 20V 0.6V to 19.5V OUT LT 0111 REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORA TION 2010 V OUT 5V 0.5A 436112fa ...

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